#13234: Yesod and Persistent cause compiler panic ----------------------------------------+--------------------------------- Reporter: cheshircat | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 Keywords: | Operating System: Linux Architecture: Unknown/Multiple | Type of failure: None/Unknown Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: ----------------------------------------+--------------------------------- Hello, This is my first bug report for GHC, so excuse me if I don't have all the formatting correct, and please tell me how to correct it! I am working on a yesod app, and upon running cabal run, I got this message: {{{#!hs Preprocessing executable 'creative-index-org' for creative-index- org-0.0.0... [1 of 1] Compiling Main ( Main.hs, dist/build/creative-index- org/creative-index-org-tmp/Main.o ) <no location info>: error: ghc: panic! (the 'impossible' happened) (GHC version 8.0.2 for x86_64-unknown-linux): initTc: unsolved constraints WC {wc_insol = [W] person_aodw :: t_aodv[tau:1] (CHoleCan: person)} Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} I have attached Main.hs, the cabal file, and a nix-shell file (in case you use nix) that contains the environment I was running this in. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13234 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler